Cooperative Sectorized Transmission Coordination
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Solution Overview
Problem
Existing wireless communication systems face challenges in coordinating and optimizing sectorized transmissions across multiple access points (APs) to ensure efficient use of spectrum and minimize interference.
Innovation Solution
The method involves using power control and clear channel assessment techniques, along with sectorized beacons and procedures, to enable coordinated and cooperative sectorized transmissions. This includes a first access point transmitting omni-directional and sectorized signals, confirming spatial orthogonality conditions, and allowing stations to coordinate sectorized clear-to-send frames for multiple AP reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple access points transmit simultaneously using sectorized beams, then spectral efficiency and network throughput are improved, but interference between overlapping basic service sets increases
Solution Approach 1:
The system divides the transmission space into multiple spatial sectors using beamforming, allowing different access points to transmit simultaneously in different spatial directions. This segmentation of the transmission medium enables concurrent transmissions without mutual interference, directly resolving the contradiction between spectral efficiency and interference.
Solution Approach 2:
The patent introduces spatial orthogonality confirmation as an intermediary mechanism between access points. Before simultaneous transmission, each access point confirms spatial orthogonality with overlapping basic service sets through omni-directional transmissions and clear channel assessment. This intermediary verification ensures that concurrent transmissions will not interfere with each other, enabling safe simultaneous transmission.
2Reliability
If access points perform clear channel assessment using omni-directional transmissions, then spatial orthogonality can be confirmed, but transmission time is increased
Solution Approach 1:
The system performs clear channel assessment and spatial orthogonality confirmation before the actual data transmission begins. By conducting these preparatory actions in advance using omni-directional transmissions, the system ensures that when simultaneous transmission occurs, all interference conditions have already been verified, allowing for efficient concurrent transmissions without time-consuming checks during the data transfer.
Data Source
AI summary
A method and apparatus may be used to support coordinated and cooperative sectorized transmissions. Power control and clear channel assessment for sectorized transmissions may be used, along with sectorized beacon and associated procedures. Transmissions in a network may be protected by a first access point (AP) sending an omni-directional transmission and a beamformed or sectorized transmission to a station (STA), an overlapping basic service set (OBSS) confirming a spatially orthogonal (SO) condition based on the omni-directional transmission, and a second AP monitoring the omni-directional transmission and confirming the SO condition. The STA may be configured to receive a request-to-send (RTS) frame indicating data is available for transmission, and transmit a cooperative sectorized (CS) clear-to-send (CTS) frame indicating an ability for multiple AP reception.